# Microsoft Aion 1.0 — On-Device Windows AI Lineup Debuts at Build 2026 With Aion 1.0 Instruct in Edge Insider Today and a 14B Aion 1.0 Plan Reasoning + Tool-Calling Model Shipping In-Box

> Microsoft ships a Windows-native AI model line: a small Instruct SLM for everyday text tasks and a 14B agentic Plan model that runs in-box.

- Org: Microsoft
- Date: 2026-06-02
- Category: model, ecosystem
- Source: https://blogs.windows.com/windowsdeveloper/2026/06/02/build-2026-furthering-windows-as-the-trusted-platform-for-development/
- Canonical page: https://ai-tldr.dev/releases/microsoft-aion-1-build2026/

## In short

Microsoft unveiled Aion 1.0 — its on-device Windows AI line — at Build 2026. Aion 1.0 Instruct is a Phi-4-mini-class SLM available in Edge Insider preview today, and Aion 1.0 Plan is a 14B reasoning + tool-calling model shipping in-box on capable Windows PCs.

## What it is

Aion 1.0 is Microsoft's new on-device Windows AI model family announced at Build 2026 on June 2. It is distinct from the cloud-hosted MAI lineup also shown the same day. Two variants debuted: Aion 1.0 Instruct, a small language model designed for everyday text intelligence (summarization, rewrite, intents, accessibility), and Aion 1.0 Plan, a 14-billion parameter reasoning and tool-calling model with a 32K context window built for fully agentic workflows running locally.

## How it works

Aion 1.0 Instruct is smaller and faster than Phi-4-mini and runs across CPUs, GPUs, and NPUs, with a developer preview shipping in the Edge Insider channel and an open-source release planned on Hugging Face in July 2026. Aion 1.0 Plan ships in-box on capable Windows PCs and exposes structured outputs and tool-call orchestration so applications can reason over user intent, invoke tools, manage files, and orchestrate sub-agents. Microsoft pairs the models with an expanded Windows AI APIs surface, including a public-preview Speech Recognition API and Video Super Resolution running on GPU and CPU rather than NPU-only.

## Why it matters

Until now, on-device LLMs on Windows mostly meant third-party stacks (Llama, Phi via Foundry Local, Liquid LFM). Aion makes a frontier-class agent loop a first-party Windows capability, ships it across the Windows install base, and shores up the local layer of Microsoft's agent push at Build. For app developers it means a Windows-guaranteed agentic runtime they can target without a cloud API key; for users it shifts assistant work — file orchestration, app automation — onto the PC.

## Who it's for

Windows app developers, on-device agent builders, enterprise IT planning local AI deployments

## Try it

Edge Insider channels for Aion 1.0 Instruct preview

## Links

- [Windows Dev Blog](https://blogs.windows.com/windowsdeveloper/2026/06/02/build-2026-furthering-windows-as-the-trusted-platform-for-development/)
- [Thurrott Recap](https://www.thurrott.com/a-i/336953/build-2026-microsoft-brings-more-on-device-ai-to-edge)
- [Build 2026 Live Blog](https://news.microsoft.com/build-2026-live-blog/microsoft-build-2026-live/)